Process of extracting products from wood.



PATENTED APR. 30

F. POPE. PROCESS OF EXTRACTING PRODUCTS FROM WOOD.

APPLIOATION FILED SEPT. 6. 1906.

24 a 5141mm Foz wwmaooeo O H M O UNITED I sTATEs v PATENT mm FREDERICK,POPE, or NEW YORK, N. Y., ASSIGNOR or pNE-i-LALF TO WILLIAM CLARK, OFPITTSBURG, PENNSYLVANIA.

'PRocsss OF "EXT AQTING PRODUCTS FROM wooo.

Near-52,978.

To all whom it may concern: I

Be it known that I, FREDERICK POPE, a citizen of the United States, andaj resident of the city, county, and State of New York, have invenred acertain new and juseful process of extracting products from 'wood inorder to obtain therefrom the resin,1oils, and gaseous products withoutharm to the wood iiber, of which the following is a specification. Oneof the objects ofi my invention is to produce a process by whichvaluable products may be obtained from wood in greater quantity, withless waste, with less cost and more conveniently than has heretoforebeen done by any process now employed.

Other objects will appear from the followin description:

will describe my process as applied to the treatment of coniferous woodsfor the purpose of obtaining turpentine, resin, pine oil and otherproducts therefrom.

In carryin out-my process the wood is placed in a c osed-chamberor avessel and treated under moderate pressure of say ten pounds to the suare inch, in a bath which is mobile at usua temperatures, whichvolatilizes only slowly at a temperature lower than the temperature atwhich the desired products volatilize, which is heated outside thevessel and is circulated over and around the wood being. treated.

The operation is not destructive of the wood, but leaves it'in goodcondition for treatment with creosote so that it may be used in Woodpavement or for other purposes;

During the operation of the process the bath is soconfined andis'subject to such ressure as to prevent any va orization. buch portionsof the bath as are s owly vaporized are separated from the desired rod-4 not after extraction and returned to the ath. The volatile productsare separated in the vaporizing chamber while the resin and the like areretained in the bath until the excess is drawn oif.

The accompanying drawing represents a side view of the preferredapparatus for carrying out my process:

Referring now to the drawing, the part lettered A s a coil in thewarming furnace.

Specification of Letters Patent.

-' Patented April 80, 1907.

Application filed'fleptainber 6,1906. Serial No. 888.682.-

This furnace is provided with the usual grate bar 1', and it is alsoprovided with baffle plates t which extend between the branches of thecoil as shown in the drawing.

'--.B is a closed vessel or chamber in which the wood to be treated forthe purpose of extracting the products is placed through a door 1). v

C is a vaporizing chamber in the bottom of which is a perforated steampipe s.

D is a reservoir having located under it grate bars 1" with a pipe whichleads from this reservoir D to a pump E. From this pump to the coil A isa pipe g. This coil A is connected to the chamber B by a pipe h. In thispipe h is a valve y connected to the pipe h by a T connection and thereis a piped which leads to and is connected with the vaporizing chamber0. In this pipe i near its connection with the pi )e h is a valve 2.Leading from the top of t e chamber B to the vaporizing chamber C isanother pipe 7c is a pipe which leads from the vaporizing chamber 0 tothe reservoir D.

Z is a pipe which leads from the bottom of the closed chamber A into thereservoir D.

In this pipe near the chamber B is a valve 01:.

m is a pipe which leads from the top of the vaporizing chamber 0 to acondenser not shown. A

The wood from which the products are to be extracted is placed in carswhich are run into the vessel B through the door p when the door isclosed. The bath is formed in the reservoir D, fire is applied 011 thegrate bar 1" for the purpose of mixing the constituents of the bath, andmay afterward be allowed to die out. The pump E is set in motion andthebath is drawn through the pipe f and forced through the pipe g intothe coil A over a fire on the grate 1' where the bath is heated in thecoil A to a temperature of about 360 F. From this coil A the bathpassesthrough the pipe it, through the valve 11 which has been opened into theclosed vessel or extractor B, where it circulates about and around thewood which has been placed in the said vessel. As soon asthe vessel B iscompletely full the bath passes through the pipe 1' into the eh amber Cand spreads out over the splay n which meets incoming steam esca ingthrough the perforated pipe 8 leading rom a boiler not shown. When theextraction-is completethe valves :1: and z are open and-the valve' yclosed, whereupon the bath in the extractor B flows through the pipe 1into the reservoir D. During this time the pump is kept in action tocirculate the bath through the warming furnace, the vaporizing chamberand the pipes, the bath and the appara tus by this being kept hot duringthe operation. When the bath has flowed out ofthe extractor B into thereservoir D the door p is open and the-car carrying the treated Wood isremoved and a new charge is placed in the extractor or chamber B. r

I have found that the most efficient bath and one that will not freezeat ordinary temperatures or waste unduly by vaporization is acomposition of pine tar carefully strained and washed with hot water andsteam, the heavy residuum of my process after refinement and pine oil.-These ingredients are combined in the proportion of 9 parts of tar, 1/2 part of the residuum and 1/2 part of pine oil, total 10. This bath isespecially adapted uum referred to is obtained as follows: Be-

yond the vaporizing chamber C in which the material extracted fromthewood is collected, other steps follow: First, the separation of thewater and the refinement of the product extracted from the wood. In thisprocess of refinement, there is first driven over at moderatetemperatures a light oil, at slightly higher temperature heavy oil, andthen a still heavier oil at about 580 F. There is left a heavy darkcolored residuum which is not vaporized at any further temperature up to800. This heavy residuum is. an excellent material with which to retardevaporation of the oil in the bath as hereinabove referred to. Further,to prevent this evaporation of the bath or any of itsconstituents,conduct the process of extraction in the closed chamber under pressure,and I conveniently secure this pressure in the extractor or closedchamber by placing the vaporizing chamber 0 and the mouth of the pipe ona somewhat higher level than the extractor B.

No vaporization takes place in the extractor, as the fluid therein isunder pressure, but on entering the vaporizing chamber C the volatileproducts pass off through m to the condenser, and some of them aremehanically carried over by ,the steam entering through, the

" bath'and that in volatility por from the vessel.

seams fperforated steam pipe 8. The bath is thus reed from the volati earoducts and passes through the pipe is into't e reservoir D to usedover and over a ain, while the volatile, constituents of the batvaporize so slowly thatrit isbut little diminished. To compensate forthe small loss of the bath a quantity of pine oil recovered from therefining of the turpentine is occasionally restored to the reservoir.

It might be Well to call attention to the fact that the proportions ofthe'bath which I use may be varied somewhat during summer and Winter,but the essential properties of the bath are mobility at ordinarytemperatures and its low volatility.

I am aware that resin has been used for the it is satisfactory,

but it presents the practical difficulty of freezing up in the valvesand clogging up the piples and bringing the operation to a stand Stl myimproved bath I not only avoid these difficulties, but I obtain a largeroutput from the wood, materially cut down the time of treatment andavoid cooling the bath or allowing the temperature to run down, andwithout cooling any part of the apparatus except the extractor, and byproper insulation the loss of heat from the extractor is reduced to aminimum:

What I claim as new and desire to secure by Letters Patent, is:

1. The process of treating wood which consists in placing wood in aclosed vessel, circulatin t rough the vessel a hot bath'which is mobi eat usual temperatures, which slowly volatilizes, and which is maintainedin thevessel at a pressure sufficiently high above atmospheric pressureto prevent any substantial escape of vapor from the vessel.

2. The process of treating wood for the purpose of extracting productstherefrom, which consists in placing the wood in a closed Ves sel,circulatin through the vessel a hot bath which is mobi e at usualtemperatures, which Pine oil is much more searching. With slowlyvolatilizes, which is a solvent, and

which is maintained in the vessel at a pressure sufficiently high aboveatmospheric ressure to prevent any substantial escape o va- 3. Theprocess of extracting oil, turpentine and resin, from wood, whichconsists in circulating through the vessel a hot bath which is mobile atusual temperatures, which slowly volatilizes and whiclris maintained inthe vessel at a pressure sufficiently high above atmospheric pressure toprevent an substantial escape of vapor" from the vesse 4. The process ofextracting products from wood, which consists in circulating through thevessel a hot bath of pine tar, heavy residuum of wood extraction andpine oil. a

5. The process which consists in placing t the wood in a closed vessel,circulating hand and seal at the city of New York, in the through thevessel above atmospheric pres- 1 county and State of New York, this 28thday sure a hot bath of pine tar, heavy residuum l of August, 1906 ofwood extraction and pine oil, separating FREDERICK POPE. [L. s.] 5theproducts extracted from the bath and 5 in presence of then separatingthe products by distillation. j JOHN J. RANAGAN,

In witness whereof, I have hereunto set my HENRY Bossono.

